public class Variable {
    final double PI = 3.14;
    public static void main(String[] args) {
        int a = 3, b = 4, temp;
        temp = a;
        a = b;
        b = temp;
//        System.out.println(a);
//        System.out.println(b);
        System.out.printf("a = %d,b = %d", a, b);


        boolean male = true;
        long people = 1000000000000000L;
        double salary = 10000.0;
    }
}
